I would not go to 15 teeth for a front.
16s only give 9 effective teeth for power transmission.
A 15 reduces the effective tooth count PLUS reduces the radius of the drive circle thus also increasing chain stress even more.
Why do that for a drag application, which is the worst for shock loads because of the launch of every run, plus the chain spends most of its time seeing higher torque multiplications because it's in the lower gears as compared to the upper gears?
True, a larger rear sprocket will alter the squat/anti-squat relationship and result in less anti-squat, but a rear spring can remedy that.
Just because it's the easiest and cheapest thing to do, does not necessarily make it advantageous in any other way.
Oh well, I don't care, I like the 15 up front, my chain was too short to add a bigger rear sprocket.
I had the shop fit the new chain and sprockets when they put the new tyres on,
there is no adjustment there to play with, the axle is hard up against the swing arm, and they didn't give me the left over links. I don't ride like a madman, and my chain is a DID 530
So it was either leave it stock or change the front, and I love the way it delivers power now with the 15, it's awesome to ride through the hills, so it's staying on.
My chain was practically new at the time, when I need a new one I'll try a 16/45 with a DID 520